Allow to continue audio playback in background (close #8642)

AspenProject/AspenProject-Info.plist

@@ -158,6 +158,10 @@
 	<array>
 		<string>armv7</string>
 	</array>
+	<key>UIBackgroundModes</key>
+	<array>
+		<string>audio</string>
+	</array>
 	<key>UIStatusBarStyle</key>
 	<string>UIStatusBarStyleBlackOpaque</string>
 	<key>UIStatusBarTintParameters</key>